Crypto currencies are very popular and probably it's best to google for resources in your own language. For official resellers check our list:
viewtopic.php?f=5&t=4703. Basically you will need to get an account on crypto exchange of your choice (stick to big, trusted ones:
https://coinmarketcap.com/rankings/exchanges/). You will need to add funds to your account (e.g. via bank transfer), buy some crypto and pay with it. Most crypto exchange accounts act as wallets, so while it's not optimal to use them that way it's possible and easy for beginners. You can use any service you want but for beginners I would advise to stay away from Binance because new people tend to be confused by their interface. They heavily promote their own coins and we don't accept them.